Like other whales, they've also got ribs around their
lungs and
many species have got humps or dorsal
fins.

As opposed to the
baleen whales, however, toothed
whales (including dolphins) have got
large melons
in their foreheads, which produce the clicks they use in echolocation.As
opposed to dolphins, large baleen whales don't use echolocation and
consequently lack the melons.